Anthraquinone dye and process of making same.



' UNITED STATES Patented January 10, 1905.

PATENT OFFICE.

HEINRICH WELTZ, OF LUDWIGSHAFEN-ON-THIERHINE, GERMANY, ASSIGNOR TOBADISOHE ANILIN UND SODA FABRIK, OF LUD= WIGSHAFEN-ON-THE-RHINE,GERMANY, A CORPORATION.

ANTHRAIQUINONE DYE AND PROCESS OF MAKING SAME.

srncmIcA'noN forming part bf Letters Patent Application filed October 8,1903. Serial No. 176,292.

To all whom it may concern: 1 I

Be it known that I, HEINRICH WELTZ, doctor of philosophy and chemist, asubject of the King of Bavaria, residingat Ludwigshafemon-th'e-Rhine, intheKingdom of Bavaria, Em;- pire of Germany, haveinvented' new anduseful Improvementsin Anthraquinone Coloring- Matter and Processes ofMaking the Same,

ofwhich the following is a specification.

I have discovered that the pol'yhydroxy-anthraquinone sulio-aciddescribed in thespecification of Letters Patent No. 754,264, March .8,1904, which can beobtained by acting on anthraquinone-beta-mono-sulfo-acid with concentrated sulfuric acid, mercury or mercuric salts, andnitrous 'acid in the presence of arsenic acidor phosphoric acid; can beconwith the sulfo-acids of aromatic amins, under which term 1 includethe salts of such sult'o-acids, giving rise to new coloring-matters.soluble in water. The condensation can be efa iected, for example,either in the presence'or in the absence of water and with the additionor not of a condensation agent.

new coloring-matter is distinguished by the following reactions: It issoluble in water,

giving a red solution, which on the addition of ammonia or sodiumcarbonate becohnes violet to reddish-blue. Onthe addition of causticsoda it becomes blue. Its solution inconcentrated sulfuric acid(containing ninety-six [96] per cent. of H2804) is red and becomesviolet-blue to blue-violet on the addition of boric acid. It is solublein-hotanilin, the coloring-matter of Exa'm'plel, yielding a vio letsolution. agnum The following examples will serve to further illustratethe nature of my invention; but

it is not confined to these examples. I The parts are by Weight. v i

Example 1: Heat together in an autoclave for one-(1)'hour at atemperatlii'e of from two hundred to two hundred and five degreescentigrade(200 -205 C.) twenty'(20) parts of theabove-mentionedpolyhydroxy-anthraquin gne-sulfo-acid sodium' salt, ten (10) parts of pi.

horic anhydrid, and forty (40) parts of s u a shlfanilate, (equaltothirty-three [33] No. 779,825, dated January 10,1905.

I parts of sulfanilic acid.) The mass gradually becomes dark. Pour thereaction product into Water, boil, and precipitate the coloringmatter bymeans of common salt. Filter and wash with a solution of common salt.The

coloring-matter so obtained dyes unm ordanted wool in bluish-red shades,chrome-mordanted wool in reddish-blue shades, and alumina-mordantedwoolin violet shades.

Example 2: Dissolve in eighty (80)'pa1"ts of water twenty (20) parts ofthe aforementioned polyhydroxy anthraquinone sulfo acid sodium salt andforty (40) parts-of sodium metanilate. Heat; the mixture in anenameledautoclave for about one (1) hour at a temperature of aboutone'hundred and seventy degrees centigrade,(170 C.) Work up theresultingproduct as explained in the foregoing Example 1. somewhat redder shadesthan does that ob-.

sulfanilic acidor metanilic acid er sulfoacids of aromatic amidobodies'can be em-.

ployed. I claim 1. The process of manufacturing anthracenecoloring-matter by condensing the herei'nbcfore-mentioned purpurin sulfo,acid with a sulfo-acid of an aromaticamido body.

2. The process of manufactu ring anthracene coloring-matter bycondensing the hereinbefore-mentioned pur 'urin sulfo-acid withmetanilic acid.

3. The new col ring-matter such as can be obtained by condensingtogether the herein- .before-mentioned purpuri'n sulfo-acid and a Thecoloring-matter dyes wool tained according to Example 1. In place oflJCfOIO-IDGDfilOIlGd purpu'rinsulfo-acid andmet- In testimony whereof Ihave hereunto set {LDlllC acid, which dissolves in hot water with myhand in the presence of two subscribing 1O a red color, which color on,the addition of Witnesses.

ammonia, or sodium'cm'bonzite, becomes vio- *5 let, Whose solution inconcentrated sulfuric I ,acid is red and becomes on the addition ofbol/Vitnesses: gjc acid violet-bloc, andwhich dissolves in hot ERNEST E.EHRHARDT,

nilin yielding a violet solution. J. ALEC. LLOYD.

v HEINRICH WELTZ.

